Bonsoir,
A=9/5-8/7
A=63/35-40/35
A=23/35
B=3-9/4
B=12/4-9/4
B=3/4
B=0,75
C=48/69*23/96
C=2⁴*3*23/(3*23*2⁵*3)
C=1/(2*3)
C=1/6
D=16/7:-12/21
D=16/7*21/-12
D=4*4*7*3/(-1*7*4*3)
D=4/-1
D=-4
E=3*7/2
E=21/2
E=10,5
F=8/5+3/4:9/8
F=8/5+3/4*8/9
F=8/5+6/9
F=72/45+30/45
F=102/45
F=34/15